зеркало из https://github.com/mozilla/gecko-dev.git
125 строки
3.6 KiB
C++
125 строки
3.6 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#if !defined(WavDumper_h_)
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# define WavDumper_h_
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# include <stdio.h>
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# include <stdint.h>
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# include <nsTArray.h>
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# include <mozilla/Unused.h>
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# include <mozilla/Atomics.h>
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# include <mozilla/DebugOnly.h>
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# include <mozilla/Sprintf.h>
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# include <ByteWriter.h>
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/**
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* If MOZ_DUMP_AUDIO is set, this dumps a file to disk containing the output of
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* an audio stream, in 16bits integers.
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*
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* The sandbox needs to be disabled for this to work.
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*/
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class WavDumper {
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public:
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WavDumper() = default;
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~WavDumper() {
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if (mFile) {
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fclose(mFile);
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}
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}
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void Open(const char* aBaseName, uint32_t aChannels, uint32_t aRate) {
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using namespace mozilla;
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if (!getenv("MOZ_DUMP_AUDIO")) {
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return;
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}
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static mozilla::Atomic<int> sDumpedAudioCount(0);
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char buf[100];
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SprintfLiteral(buf, "%s-%d.wav", aBaseName, ++sDumpedAudioCount);
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mFile = fopen(buf, "wb");
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if (!mFile) {
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NS_WARNING("Could not open file to DUMP a wav. Is sandboxing disabled?");
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return;
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}
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const uint8_t riffHeader[] = {
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// RIFF header
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0x52, 0x49, 0x46, 0x46, 0x00, 0x00, 0x00, 0x00, 0x57, 0x41, 0x56, 0x45,
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// fmt chunk. We always write 16-bit samples.
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0x66, 0x6d, 0x74, 0x20, 0x10, 0x00, 0x00, 0x00, 0x01, 0x00, 0xFF, 0xFF,
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0xFF, 0xFF, 0xFF, 0xFF, 0x00, 0x00, 0x00, 0x00, 0xFF, 0xFF, 0x10, 0x00,
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// data chunk
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0x64, 0x61, 0x74, 0x61, 0xFE, 0xFF, 0xFF, 0x7F};
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AutoTArray<uint8_t, sizeof(riffHeader)> header;
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ByteWriter<LittleEndian> writer(header);
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static const int CHANNEL_OFFSET = 22;
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static const int SAMPLE_RATE_OFFSET = 24;
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static const int BLOCK_ALIGN_OFFSET = 32;
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DebugOnly<bool> rv;
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// Then number of bytes written in each iteration.
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uint32_t written = 0;
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for (size_t i = 0; i != sizeof(riffHeader);) {
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switch (i) {
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case CHANNEL_OFFSET:
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rv = writer.WriteU16(aChannels);
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written = 2;
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MOZ_ASSERT(rv);
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break;
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case SAMPLE_RATE_OFFSET:
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rv = writer.WriteU32(aRate);
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written = 4;
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MOZ_ASSERT(rv);
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break;
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case BLOCK_ALIGN_OFFSET:
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rv = writer.WriteU16(aChannels * 2);
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written = 2;
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MOZ_ASSERT(rv);
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break;
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default:
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// copy from the riffHeader struct above
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rv = writer.WriteU8(riffHeader[i]);
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written = 1;
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MOZ_ASSERT(rv);
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break;
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}
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i += written;
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}
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Unused << fwrite(header.Elements(), header.Length(), 1, mFile);
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}
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template <typename T>
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void Write(const T* aBuffer, uint32_t aSamples) {
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if (!mFile) {
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return;
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}
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WriteDumpFileHelper(aBuffer, aSamples);
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}
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private:
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void WriteDumpFileHelper(const int16_t* aInput, size_t aSamples) {
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mozilla::Unused << fwrite(aInput, sizeof(int16_t), aSamples, mFile);
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fflush(mFile);
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}
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void WriteDumpFileHelper(const float* aInput, size_t aSamples) {
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using namespace mozilla;
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AutoTArray<uint8_t, 1024 * 2> buf;
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ByteWriter<mozilla::LittleEndian> writer(buf);
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for (uint32_t i = 0; i < aSamples; ++i) {
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DebugOnly<bool> rv = writer.WriteU16(int16_t(aInput[i] * 32767.0f));
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MOZ_ASSERT(rv);
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}
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mozilla::Unused << fwrite(buf.Elements(), buf.Length(), 1, mFile);
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fflush(mFile);
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}
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FILE* mFile = nullptr;
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};
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#endif // WavDumper_h_
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